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Please make your example compilable (MWE). That includes the documentclass and the document environment.
– TeXnicianMay 7 '17 at 11:22

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Is the label empty like ()REQ-2.0-C or is it like (REQ-2.0-C)?
– MoriambarMay 7 '17 at 11:35

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I suggest you use the enumitem package: it defines keys label=(formatting commands) and ref=(own formatting commands).
– BernardMay 7 '17 at 12:01